如何解决gradle插件创建的依赖冲突？

Question

我正在尝试更新我的Android O应用程序,并且这样做需要更新以支持库26.

我的compileSdkVersion是26,targetSdkVersion 26,buildToolsVersion 26.0.1,支持库版本是26.0.1,播放服务/ firebase消息是11.0.4.我正在使用Android Studio 3.0 b2和android gradle插件3.0.0-beta2.看来这个版本对支持库冲突更加敏感.

我必须手动排除支持依赖项以解决冲突,因为播放服务和firebase链接对旧版本的支持库:

implementation("com.google.android.gms:play-services-auth:$playServicesVersion",{
    exclude group: 'com.android.support'
})

implementation("com.google.android.gms:play-services-identity:$playServicesVersion",{
    exclude group: 'com.android.support'
})

implementation("com.google.android.gms:play-services-base:$playServicesVersion",{
    exclude group: 'com.android.support'
})

implementation("com.google.android.gms:play-services-analytics:$playServicesVersion",{
    exclude group: 'com.android.support'
})

implementation("com.google.firebase:firebase-messaging:$playServicesVersion",{
    exclude group: 'com.android.support'
})

implementation("com.google.firebase:firebase-analytics:$playServicesVersion",{
    exclude group: 'com.android.support'
})

这修复了我的所有依赖冲突,除了一个.

Google Play服务/ Firebase需要使用google-services gradle插件来解析生成的.json文件,并在应用中包含必要的密钥/秘密.我的build.grade有一个buildcript块,如下所示:

buildscript {
    repositories {
        maven { url "https://maven.google.com" }
        jcenter()
    }

    dependencies {
        classpath "com.google.gms:google-services:3.1.0"
    }
}

在脚本的最后,我应用插件.随着apply和classpath被注释掉,一切都正确编译.但是,似乎google-services 3.1.0增加了对支持库版本25.2.0的依赖,而我无法弄清楚如何覆盖它.消息是:

• 出了什么问题:任务':app:preDevelopmentDebugBuild'执行失败.

  Android依赖项"com.android.support:support-v4"具有不同版本的编译(25.2.0)和运行时(26.0.1)类路径.您应该通过DependencyResolution手动设置相同的版本

请注意,我甚至无法降级到支持库25.4.0,因为我得到了相同的错误(只需用25.4.0替换上面的消息中的26.0.1).唯一有效的版本是25.2.0

运行./gradlew app:dependencies包含类路径依赖项,给我这个:

compile - Compile dependencies for 'main' sources (deprecated: use 'implementation' instead).
\--- com.google.firebase:firebase-core:11.0.4
     \--- com.google.firebase:firebase-analytics:[11.0.4] -> 11.0.4
          +--- com.google.firebase:firebase-analytics-impl:[11.0.4] -> 11.0.4
          |    +--- com.google.android.gms:play-services-basement:[11.0.4] -> 11.0.4
          |    |    \--- com.android.support:support-v4:25.2.0
          |    |         +--- com.android.support:support-compat:25.2.0
          |    |         |    \--- com.android.support:support-annotations:25.2.0
          |    |         +--- com.android.support:support-media-compat:25.2.0
          |    |         |    +--- com.android.support:support-annotations:25.2.0
          |    |         |    \--- com.android.support:support-compat:25.2.0 (*)
          |    |         +--- com.android.support:support-core-utils:25.2.0
          |    |         |    +--- com.android.support:support-annotations:25.2.0
          |    |         |    \--- com.android.support:support-compat:25.2.0 (*)
          |    |         +--- com.android.support:support-core-ui:25.2.0
          |    |         |    +--- com.android.support:support-annotations:25.2.0
          |    |         |    \--- com.android.support:support-compat:25.2.0 (*)
          |    |         \--- com.android.support:support-fragment:25.2.0
          |    |              +--- com.android.support:support-compat:25.2.0 (*)
          |    |              +--- com.android.support:support-media-compat:25.2.0 (*)
          |    |              +--- com.android.support:support-core-ui:25.2.0 (*)
          |    |              \--- com.android.support:support-core-utils:25.2.0 (*)
          |    +--- com.google.firebase:firebase-iid:[11.0.4] -> 11.0.4
          |    |    +--- com.google.android.gms:play-services-basement:[11.0.4] -> 11.0.4 (*)
          |    |    \--- com.google.firebase:firebase-common:[11.0.4] -> 11.0.4
          |    |         +--- com.google.android.gms:play-services-basement:[11.0.4] -> 11.0.4 (*)
          |    |         \--- com.google.android.gms:play-services-tasks:[11.0.4] -> 11.0.4
          |    |              \--- com.google.android.gms:play-services-basement:[11.0.4] -> 11.0.4 (*)
          |    +--- com.google.firebase:firebase-common:[11.0.4] -> 11.0.4 (*)
          |    \--- com.google.android.gms:play-services-tasks:[11.0.4] -> 11.0.4 (*)
          +--- com.google.android.gms:play-services-basement:[11.0.4] -> 11.0.4 (*)
          \--- com.google.firebase:firebase-common:[11.0.4] -> 11.0.4 (*)

Answer 1

configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == 'com.android.support') {
                if (!requested.name.startsWith("multidex")) {
                    details.useVersion '26.0.1'
                }
            }
        }
    }

像这样,您的支持库应该使用相同的版本进行编译.只需将模块级Gradle构建脚本中的代码段添加到依赖项中.